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Outoing mail doesn't work

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I have just set up Thunderbird and am receiving incoming emails but receive the following message when sending messages

An error occurred while sending mail. The mail server responded: 5.7.1 <sue.allerton@gmail.com>... Relaying denied: You must check for new mail before sending mail..

Please check the message recipient "sue.allerton@gmail.com" and try again.
I have spoken to my ISP and I have set-up the outgoing server details correctly.  

Can you help please.

I have just set up Thunderbird and am receiving incoming emails but receive the following message when sending messages An error occurred while sending mail. The mail server responded: 5.7.1 <sue.allerton@gmail.com>... Relaying denied: You must check for new mail before sending mail.. Please check the message recipient "sue.allerton@gmail.com" and try again. I have spoken to my ISP and I have set-up the outgoing server details correctly. Can you help please.

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If you were setup correctly your providers server would not issue the error message. It is too bad that your providers tech support is not smart enough to know that. http://kb.mozillazine.org/5.7.1_Unable_to_relay